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Cathode Ray Tube Deflection Circuit

Publishing Venue

IBM

Related People

Lamoureux, WR: AUTHOR

Abstract

This circuit is a current driver for a cathode ray tube (CRT) deflection coil. It is responsive to CRT beam-positioning signals of both high and low frequency notwithstanding that the circuit contains a single deflection amplifier responsive to only low frequency beam-positioning signals.

Country

United States

Language

English (United States)

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Cathode Ray Tube Deflection Circuit

This circuit is a current driver for a cathode ray tube (CRT) deflection coil. It
is responsive to CRT beam-positioning signals of both high and low frequency
notwithstanding that the circuit contains a single deflection amplifier responsive
to only low frequency beam-positioning signals.

The circuit has a deflection coil C connected between resistor R which in turn
is connected to a source of positive potential + V, transistor T1 connected to a
source of negative potential -V and transistor T2 connected in a grounded base
configuration. Connected in parallel with C is an input circuit comprising
transistor T3, resistor R2 and deflection amplifier A, which is responsive only to
low frequency variations. Therefore, only low frequency beam-positioning
signals applied to the base of transistor T3 are amplified and reflected as current
variations in coil C.

To achieve sensitivity to high frequency beam-positioning signals, transistor
switching circuitry comprising transistor T4 is connected in series with parallel-
connected transistors T5 and T6, this circuit being connected in parallel with coil
C and T2.

Like T2, T4 functions as a voltage buffer to provide a high impedance output
such that the current at the collector is substantially independent of the voltage.
When T2 and T3 are switched on, thus rendering the high frequency portion of
the circuit conductive, a portion of the constant current through the C circuit is
shunted t...